diff --git a/ReleaseNotes.md b/ReleaseNotes.md
index 5538859..06ac966 100644
--- a/ReleaseNotes.md
+++ b/ReleaseNotes.md
@@ -1,3 +1,6 @@
+### New in 1.3.1 (Released (2019/08/19)
+* Bug fix for Getting Changed Sales
+
 ### New in 1.3.0 (Released (2019/08/19)
 * Add change ticket type to sales client
 
diff --git a/Version.props b/Version.props
index bc380dc..106b0ba 100644
--- a/Version.props
+++ b/Version.props
@@ -1,6 +1,6 @@
 <Project>
     <PropertyGroup>
-        <VersionPrefix>1.3.0</VersionPrefix>
+        <VersionPrefix>1.3.1</VersionPrefix>
         <VersionSuffix>
     </VersionSuffix>
     </PropertyGroup>
diff --git a/src/GogoKit/Clients/SalesClient.cs b/src/GogoKit/Clients/SalesClient.cs
index 2d2c2bc..4da4325 100644
--- a/src/GogoKit/Clients/SalesClient.cs
+++ b/src/GogoKit/Clients/SalesClient.cs
@@ -70,7 +70,13 @@ public Task<ChangedResources<Sale>> GetAllChangesAsync(Link nextLink)
         {
             return GetAllChangesAsync(
                 nextLink,
-                new SaleRequest {Sort = new[] {new Sort<string>("resource_version", SortDirection.Ascending)}});
+                new SaleRequest
+                {
+                    Sort = new[]
+                    {
+                        new Sort<SaleSort>(SaleSort.ResourceVersion, SortDirection.Ascending)
+                    }
+                });
         }
 
         public Task<ChangedResources<Sale>> GetAllChangesAsync(
diff --git a/src/GogoKit/Models/Request/SaleRequest.cs b/src/GogoKit/Models/Request/SaleRequest.cs
index bce55c9..e09accc 100644
--- a/src/GogoKit/Models/Request/SaleRequest.cs
+++ b/src/GogoKit/Models/Request/SaleRequest.cs
@@ -1,6 +1,24 @@
-namespace GogoKit.Models.Request
+using System.Collections.Generic;
+
+namespace GogoKit.Models.Request
 {
-    public class SaleRequest : RequestParameters<string, string>
+    public class SaleRequest : RequestParameters<SaleEmbed, SaleSort>
     {
+        protected override IDictionary<SaleSort, string> SortFieldNameMap =>
+            new Dictionary<SaleSort, string>
+            {
+                {SaleSort.CreatedAt, "created_at"},
+                {SaleSort.ResourceVersion, "resource_version"}
+            };
+    }
+
+    public enum SaleEmbed
+    {
+    }
+
+    public enum SaleSort
+    {
+        CreatedAt,
+        ResourceVersion
     }
 }